CRO Module 2 Exam 1 Questions & Answers 2024/2025
Throughout the process, name three key mixes/material that rely heavily on proper fineness/PSD/surface area for proper performance. - ANSWERSKiln Feed, Fuels, Finished Cement
A material with a ____ Bond Work Index is easier to grind. - ANSWE...
Throughout the process, name three key mixes/material that rely heavily on proper
fineness/PSD/surface area for proper performance. - ANSWERSKiln Feed, Fuels, Finished Cement
A material with a ____ Bond Work Index is easier to grind. - ANSWERSLow
A material with a ____ Hardgrove Index is easier to grind. - ANSWERSHigh
A material higher on the Moh's hardness scale is _____ to grind. - ANSWERSHarder
Define grindability of a material. - ANSWERSThe resistance of a material to size reduction.
Grindability is a function of what main properties/characteristics of the material? - ANSWERSchemical
composition (RM & clinker), minerology (hardness & brittleness), crystal size (kiln burning regime)
According to comminution theory laws, work required for size reduction is proportional _______. -
ANSWERSTo the particle size distribution before and after comminution.
Which material(s) are considered some of the typically hardest to grind in the cement industry? (read all
of your choices carefully) - ANSWERSa. Silica (quartz)
b. Clinker
c. Iron Slag
Describe types of clinker that may cause it to be harder to grind downstream, compromising grinding
efficiency and cement strength development. - ANSWERSHard burnt clinker (low LSF or low FL) (brown,
dense clinker), large alite/belite crystals (long BX, slow cooling), high free lime, reducing conditions
(brown, porous clinker)
, Many of the performance properties of cement revolve around what reaction with cement? -
ANSWERSMixing water with cement (cement hydration)
What is water demand for cement? - ANSWERSPercentage of water needed for obtaining normal
consistency
Name a factor that influences water demand. - ANSWERSFineness
Composition
additives
Cement setting is mainly affected by levels of ....? - ANSWERSC3A and SO3
What properties is cement is characterized by (Name 3)? - ANSWERSi. Color
ii. Setting Time
iii. Strength (7-day, 28-day)
iv. Water Demand
v. durability
vi. Expansion
vii. Blaine
viii. Heat of Hydration
Name 2 tests performed in the physical test lab. - ANSWERSCompression strength, slump workability,
autoclave expansion, setting time test, heat of hydration test, color
What kiln operational influences can ultimately impact cement performance? - ANSWERS-Free lime (too
low or too high) via burning conditions
-Alite/Belite Crystal Size via BZ and Cooling Zone length
-Level of SO3 drained with the clinker
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